From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vladimir Pantelic Subject: Re: [PATCH] OMAP3630:DSS2:Enable Pre-Multiplied Alpha Support Date: Wed, 20 Jan 2010 07:35:15 +0100 Message-ID: <4B56A423.80209@nt.tu-darmstadt.de> References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mo-p05-ob.rzone.de ([81.169.146.180]:32158 "EHLO mo-p05-ob.rzone.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751928Ab0ATGql (ORCPT ); Wed, 20 Jan 2010 01:46:41 -0500 In-Reply-To: Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: "Y, Kishore" Cc: Tomi Valkeinen , "linux-omap@vger.kernel.org" , "Mande, Nikhil" Y, Kishore wrote: >> > As per TRM, this bit is valid only for ARGB formats and experts >> suggested that we can safely assume pre-multiplied data always in real >> world >> >> I asked a few experts here, and they weren't so sure, and neither am I. >> >> I don't see any problems making this feature configurable, but there may >> be problems if it's hardcoded. So, it should be configurable. I think >> the default should be the same as on 3430, so that they will work >> similarly. >> >> Tomi > I haven't considered the backward compatibility with 3430 apps. > I will make this configurable. And please defaulting to non-pre-multiplied. All 3430 apps will be non-pre-multiplied as this is what the 3430 supports only. So apps need to be actively changed to use pre-multiplied.